print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p4, logical block 0, async page read Buffer I/O error on dev loop2p4, logical block 0, async page read Buffer I/O error on dev loop2p4, logical block 0, async page read ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/28799 is trying to acquire lock: 00000000f2efb589 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 but task is already holding lock: 0000000092eb1a9f (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 0000000092eb1a9f (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_internal#3){.+.+}: sb_start_intwrite include/linux/fs.h:1626 [inline] start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (28848) btrfs_quota_enable+0x169/0x10b0 fs/btrfs/qgroup.c:905 btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:5233 [inline] btrfs_ioctl+0x622c/0x76d0 fs/btrfs/ioctl.c:6021 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (28866) ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&fs_info->qgroup_ioctl_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 create_subvol+0x3aa/0x1850 fs/btrfs/ioctl.c:617 btrfs_mksubvol+0xe1d/0x1160 fs/btrfs/ioctl.c:1007 btrfs_ioctl_snap_create_transid+0x2a7/0x430 fs/btrfs/ioctl.c:1771 btrfs_ioctl_snap_create_v2+0x2db/0x5d0 fs/btrfs/ioctl.c:1885 btrfs_ioctl+0x26f6/0x76d0 fs/btrfs/ioctl.c:5934 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_internal#3); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#3); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 4 locks held by syz-executor.3/28799: #0: 000000003e648b61 (sb_writers#24){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000003e648b61 (sb_writers#24){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 00000000d33f9d77 (&type->i_mutex_dir_key#11/1){+.+.}, at: btrfs_mksubvol+0x156/0x1160 fs/btrfs/ioctl.c:975 #2: 000000005879899f (&fs_info->subvol_sem){++++}, at: btrfs_mksubvol+0x35b/0x1160 fs/btrfs/ioctl.c:998 #3: 0000000092eb1a9f (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #3: 0000000092eb1a9f (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 28799 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 btrfs_qgroup_inherit+0xde/0x1c60 fs/btrfs/qgroup.c:2284 create_subvol+0x3aa/0x1850 fs/btrfs/ioctl.c:617 btrfs_mksubvol+0xe1d/0x1160 fs/btrfs/ioctl.c:1007 btrfs_ioctl_snap_create_transid+0x2a7/0x430 fs/btrfs/ioctl.c:1771 btrfs_ioctl_snap_create_v2+0x2db/0x5d0 fs/btrfs/ioctl.c:1885 btrfs_ioctl+0x26f6/0x76d0 fs/btrfs/ioctl.c:5934 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fc10ab5f0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc1090d1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc10ac7ef80 RCX: 00007fc10ab5f0d9 RDX: 0000000020000a80 RSI: 0000000050009418 RDI: 0000000000000004 RBP: 00007fc10abbaae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc873bdfff R14: 00007fc1090d1300 R15: 0000000000022000 BTRFS info (device loop2): enabling inode map caching BTRFS warning (device loop2): excessive commit interval 622039222 BTRFS info (device loop2): force zlib compression, level 3 BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor.3 (28920) BTRFS info (device loop2): using free space tree BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by systemd-udevd (28935) BTRFS info (device loop2): has skinny extents EXT4-fs (loop1): Ignoring removed nobh option EXT4-fs (loop1): couldn't mount RDWR because of unsupported optional features (10000) BTRFS info (device loop2): 3 enospc errors during balance Unsupported ieee802154 address type: 0 Unsupported ieee802154 address type: 0 BTRFS info (device loop3): enabling inode map caching BTRFS warning (device loop3): excessive commit interval 622039222 BTRFS info (device loop3): force zlib compression, level 3 BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents Unsupported ieee802154 address type: 0 BTRFS info (device loop2): enabling inode map caching BTRFS warning (device loop2): excessive commit interval 622039222 BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents BTRFS info (device loop2): 3 enospc errors during balance BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor.3 (29071) BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop1): using free space tree BTRFS warning (device loop2): excessive commit interval 622039222 BTRFS info (device loop1): has skinny extents BTRFS info (device loop2): force zlib compression, level 3 BTRFS info (device loop2): using free space tree BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (29164) BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (29209) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor.3 (29183) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by systemd-udevd (29230) BTRFS info (device loop2): 3 enospc errors during balance BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by syz-executor.3 (29374) BTRFS warning (device ): duplicate device /dev/loop3 devid 1 generation 8 scanned by systemd-udevd (29411) BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (29399) print_req_error: 63 callbacks suppressed print_req_error: I/O error, dev loop2, sector 0 print_req_error: I/O error, dev loop2, sector 8 print_req_error: I/O error, dev loop2, sector 0 buffer_io_error: 51 callbacks suppressed Buffer I/O error on dev loop2p4, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 8 Buffer I/O error on dev loop2p3, logical block 1, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p4, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p4, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p4, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p4, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p4, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p4, logical block 0, async page read Buffer I/O error on dev loop2p4, logical block 0, async page read Buffer I/O error on dev loop2p4, logical block 0, async page read JFS: discard option not supported on device BTRFS info (device loop3): enabling auto defrag netlink: 40 bytes leftover after parsing attributes in process `syz-executor.5'. BTRFS info (device loop3): setting 16 feature flag BTRFS info (device loop3): use zstd compression, level 0 JFS: discard option not supported on device BTRFS error (device loop3): open_ctree failed netlink: 40 bytes leftover after parsing attributes in process `syz-executor.5'. JFS: discard option not supported on device BTRFS info (device loop3): enabling auto defrag JFS: discard option not supported on device BTRFS info (device loop3): setting 16 feature flag BTRFS info (device loop3): use zstd compression, level 0 BTRFS error (device loop3): open_ctree failed JFS: discard option not supported on device BTRFS info (device loop3): enabling auto defrag BTRFS info (device loop3): setting 16 feature flag BTRFS info (device loop3): use zstd compression, level 0 BTRFS error (device loop3): open_ctree failed JFS: discard option not supported on device JFS: discard option not supported on device BTRFS info (device loop5): enabling inode map caching BTRFS warning (device loop5): excessive commit interval 622039222 BTRFS info (device loop5): force zlib compression, level 3 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS info (device loop5): 3 enospc errors during balance BTRFS info (device loop5): enabling inode map caching BTRFS info (device loop3): enabling auto defrag BTRFS warning (device loop5): excessive commit interval 622039222 BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by syz-executor.0 (29789) BTRFS info (device loop3): setting 16 feature flag BTRFS info (device loop5): force zlib compression, level 3 BTRFS warning (device ): duplicate device /dev/loop0 devid 1 generation 8 scanned by systemd-udevd (29811) BTRFS info (device loop3): use zstd compression, level 0 BTRFS info (device loop5): using free space tree BTRFS error (device loop3): open_ctree failed BTRFS info (device loop5): has skinny extents